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configuring-playbook-turn.md

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Adjusting TURN server configuration (optional, advanced)

The playbook installs a Coturn TURN server by default, so that clients can make audio/video calls even from NAT-ed networks.

By default, the Synapse chat server is configured, so that it points to the Coturn TURN server installed by the playbook.

Disabling Coturn

If, for some reason, you'd like to prevent the playbook from installing Coturn, add the following configuration to your inventory/host_vars/matrix.example.com/vars.yml file:

matrix_coturn_enabled: false

In that case, Synapse would not point to any Coturn servers and audio/video call functionality may fail.

Manually defining your public IP

In the hosts file we explicitly ask for your server's external IP address when defining ansible_host, because the same value is used for configuring Coturn.

If you'd rather use a local IP for ansible_host, make sure to set up matrix_coturn_turn_external_ip_address replacing YOUR_PUBLIC_IP with the pubic IP used by the server.

matrix_coturn_turn_external_ip_address: "YOUR_PUBLIC_IP"

If you'd like to rely on external IP address auto-detection (not recommended unless you need it), set matrix_coturn_turn_external_ip_address to an empty value. The playbook will automatically contact an EchoIP-compatible service (https://ifconfig.co/json by default) to determine your server's IP address. This API endpoint is configurable via the matrix_coturn_turn_external_ip_address_auto_detection_echoip_service_url variable.

If your server has multiple external IP addresses, the Coturn role offers a different variable for specifying them:

# Note: matrix_coturn_turn_external_ip_addresses is different than matrix_coturn_turn_external_ip_address
matrix_coturn_turn_external_ip_addresses: ['1.2.3.4', '4.5.6.7']

Changing the authentication mechanism

The playbook uses the auth-secret authentication method by default, but you may switch to the lt-cred-mech method which some report to be working better.

To do so, add this override to your configuration:

matrix_coturn_authentication_method: lt-cred-mech

Regardless of the selected authentication method, the playbook generates secrets automatically and passes them to the homeserver and Coturn.

If you're using Jitsi, note that switching to lt-cred-mech will remove the integration between Jitsi and your own Coturn server, because Jitsi only seems to support the auth-secret authentication method.

Using your own external Coturn server

If you'd like to use another TURN server (be it Coturn or some other one), you can configure the playbook like this:

# Disable integrated Coturn server
matrix_coturn_enabled: false

# Point Synapse to your other Coturn server
matrix_synapse_turn_uris:
- turns:HOSTNAME_OR_IP?transport=udp
- turns:HOSTNAME_OR_IP?transport=tcp
- turn:HOSTNAME_OR_IP?transport=udp
- turn:HOSTNAME_OR_IP?transport=tcp

If you have or want to enable Jitsi, you might want to enable the TURN server there too. If you do not do it, Jitsi will fall back to an upstream service.

jitsi_web_stun_servers:
- stun:HOSTNAME_OR_IP:PORT

You can put multiple host/port combinations if you like.

Further variables and configuration options

To see all the available configuration options, check roles/custom/matrix-coturn/defaults/main.yml